In free-floating plants,the stomata are

In the leaf,vascular bundles are found in the

The reticulate venation is commonly found in the leaves of

How do the various leaf modifications help plants?

In walnut,stomata are found on

Assertion $(A)$: Reticulate venation is observed in the leaves of sunflower.
Reason $(R)$: Sunflower is included in the class Dicotyledonae.